Oh and to add on to what penta said...
When you go down to try it out, best if you bring your own guitar. Different combinations of gear will sound differently, so if you wanna know exactly how your gear will sound, bring it down.
If for example you own a $2 chapalang guitar.
You go down to buy an amp. The salesperson tries it out on a JEM.
You are impressed and bring it home. Gee, I wonder what sorta sound will come out when you plug in your own guitar.